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atoponce | 4 years ago

What exactly is an OpenPGP recovery property? Can you point it out in the RFC?

discuss

order

upofadown|4 years ago

OpenPGP specifies cipher feed back (CFB) mode[1] for block ciphers (normally AES). CFB has the inherent property that it is self healing in the face of corruption. It does not work in all possible instances of corruption but it works for the normal sort of corruption that is seen with mass storage devices (multiples of 512 bytes). A practical example here[2].

[1] https://datatracker.ietf.org/doc/html/rfc4880#section-13.9

[2] https://articles.59.ca/doku.php?id=pgpfan:agevspgp#encrypted...

atoponce|4 years ago

I see. You're defining resynchronization of the register during decryption as recovery, not parity checks for recovering corrupted data. Fair enough.